IsOwner - Custom django-rest-framework permission to only allow owners of an object to edit it.

permissions.py

from rest_framework import permissions


class IsOwner(permissions.BasePermission):
    """
    Custom permission to only allow owners of an object to edit it.
    """
    def has_permission(self, request, view):
        return request.user and request.user.is_authenticated()

    def has_object_permission(self, request, view, obj):
        return obj.user == request.user

How do I restrict permissions to only owner can view it?

For this, you must edit your ViewSet. Like this exemplo, only the owner of the product can view it.

from rest_framework.authentication import TokenAuthentication
from rest_framework.permissions import IsAuthenticated
from rest_framework.viewsets import ModelViewSet

from .serializers import ProductSerializer
from ..models import Product

class ProductViewSet(ModelViewSet):
    """Handles creating, reading and updating MyUsers products"""
    authentication_classes = (TokenAuthentication,)
    serializer_class = ProductSerializer
    # get all products on DB
    queryset = Product.objects.all()
    permission_classes = (IsAuthenticated, )

    def perform_create(self, serializer):
         # when a product is saved, its saved how it is the owner
        serializer.save(owner=self.request.user)

    def get_queryset(self):
        # after get all products on DB it will be filtered by its owner and return the queryset
        owner_queryset = self.queryset.filter(owner=self.request.user)
        return owner_queryset